package com.chanct.test;

import java.security.MessageDigest;

public class test2 {
	public final static String str2MD5(String s) {
		char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
				'A', 'B', 'C', 'D', 'E', 'F' };
		try {
			byte[] btInput = s.getBytes();
			// 获得MD5摘要算法的 MessageDigest 对象
			MessageDigest mdInst = MessageDigest.getInstance("MD5");
			// 使用指定的字节更新摘要
			mdInst.update(btInput);
			// 获得密文
			byte[] md = mdInst.digest();
			// 把密文转换成十六进制的字符串形式
			int j = md.length;
			char str[] = new char[j * 2];
			int k = 0;
			for (int i = 0; i < j; i++) {
				byte byte0 = md[i];
				str[k++] = hexDigits[byte0 >>> 4 & 0xf];
				str[k++] = hexDigits[byte0 & 0xf];
			}
			return new String(str);
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}
	
	// 可逆的加密算法   
	 public static String KL(String inStr) {   
	  // String s = new String(inStr);   
	  char[] a = inStr.toCharArray();   
	  for (int i = 0; i < a.length; i++) {   
	   a[i] = (char) (a[i] ^ 't');   
	  }   
	  String s = new String(a);   
	  return s;   
	 }   
	 
	 public static String JM(String inStr) {   
		  char[] a = inStr.toCharArray();   
		  for (int i = 0; i < a.length; i++) {   
		   a[i] = (char) (a[i] ^ 't');   
		  }   
		  String k = new String(a);   
		  return k;   
		 }   
	public static void main(String[] args) {
		String a = "888888";
		System.out.println(str2MD5(a));
		System.out.println(KL(str2MD5(a)));
		System.out.println(JM(KL(str2MD5(a))));

	}

}
